The SYSDATE pseudo-column shows the current system date and time. Adding 1 to SYSDATE will advance the date by 1 day. Use fractions to add hours, minutes or seconds to the date.
Look at these examples:
SQL> select sysdate, sysdate+1/24, sysdate +1/1440, sysdate + 1/86400 from dual;
SYSDATE SYSDATE+1/24 SYSDATE+1/1440 SYSDATE+1/86400
-------------------- -------------------- -------------------- --------------------
03-Jul-2002 08:32:12 03-Jul-2002 09:32:12 03-Jul-2002 08:33:12 03-Jul-2002 08:32:13
The following format is frequently used with Oracle Replication:
select sysdate NOW, sysdate+30/(24*60*60) NOW_PLUS_30_SECS from dual;
NOW NOW_PLUS_30_SECS
-------------------- --------------------
03-JUL-2005 16:47:23 03-JUL-2005 16:47:53
Here are a couple of examples:
| Description | Date Expression |
|---|---|
| Now | SYSDATE |
| Tomorow/ next day | SYSDATE + 1 |
| Seven days from now | SYSDATE + 7 |
| One hour from now | SYSDATE + 1/24 |
| Three hours from now | SYSDATE + 3/24 |
| An half hour from now | SYSDATE + 1/48 |
| 10 minutes from now | SYSDATE + 10/1440 |
| 30 seconds from now | SYSDATE + 30/86400 |
| Tomorrow at 12 midnight | TRUNC(SYSDATE + 1) |
| Tomorrow at 8 AM | TRUNC(SYSDATE + 1) + 8/24 |
| Next Monday at 12:00 noon | NEXT_DAY(TRUNC(SYSDATE), 'MONDAY') + 12/24 |
| First day of the month at 12 midnight | TRUNC(LAST_DAY(SYSDATE ) + 1) |
| The next Monday, Wednesday or Friday at 9 a.m | TRUNC(LEAST(NEXT_DAY(sysdate,MONDAY' ' ),NEXT_DAY(sysdate,WEDNESDAY), NEXT_DAY(sysdate,FRIDAY ))) + (9/24) |
Real world examples:
(i) This first one sets the date to be the 1st of the month (by using the last_day function to get the end of the current month, then add 1 day) and the time to be 7am (7/24):
update mc_jobs set scheduledtime=TRUNC(LAST_DAY(SYSDATE ) + 1) + 7/24 where jobid=3596
(ii) And this one uses next_day to set the date to be the next Monday after today, at 6am (6/24):
update mc_jobs set scheduledtime=NEXT_DAY(TRUNC(SYSDATE), 'MONDAY') + 6/24 where jobid=3536
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